我们现在撇开美洲这个对偶制家庭的典型地区不谈吧.We now leave America, the classic soil of the pairing family.对偶体彼此相连于称为着丝粒的缩小的区域.The duplicates are attached to each other at a constricted region called the centromere.考察了加料顺序和相转移催化剂对偶联反应的影响.The ...
与水平安定面相连的是两个称为 “ 升降舵 ” 的可动操纵面.Attached to the stabilizers are two movable surface called " elevator ".俯仰力矩的变化由升降舵的偏转来提供.A variable pitching moment is provided by moving the elevator.飞机的升降舵可以使它升降自如.The elevator of an airc...